Photocatalysts made by using oxides containing metal ions of d10 electronic state

Abstract

A photo-catalyst comprising RuO 2 -loaded A 2 X n O m or RuO 2 -loaded BX n O m (wherein A is an alkali metal atom, B is an alkali earth metal atom or Zn, X is a metal ion with d 10 configuration, n=m/2 or n=m/3 and n is 2), and especially relates to a photo-catalyst for complete photo decomposition reaction of water.

What is claimed is:  
     
       1. A photo-catalyst comprising RuO 2 -loaded A 2 X n O m  or RuO 2 -loaded BX n O m , wherein A is an alkali metal atom, B is an alkali earth metal atom or Zn, X is a metal ion with d 10  configuration, n=m/2 or n=m/3 and n is 2. 
     
     
       2. The photo-catalyst of  claim 1 , wherein RuO 2 -loaded A 2 X n O m  or RuO 2 -loaded BX n O m  is obtained by a coprecipitation powder calcination method calcined at temperature of 1150 to 1200° C. 
     
     
       3. The photo-catalyst according to  claim 2 , wherein X is In, Ga or Sb, alkali metal atom is Na, K or Rb and alkali earth metal atom is Ca, Sr or Ba. 
     
     
       4. The photo-catalyst according to  claim 1 , wherein X is In, Ga or Sb, alkali metal atom is Na, K or Rb and alkali earth metal atom is Ca, Sr or Ba. 
     
     
       5. A powder composition yielding a complete photo-decomposition reaction of water comprising a photo-catalyst comprising RuO 2 -loaded A 2 X n O m  or RuO 2 -loaded BX n O m , wherein A is an alkali metal atom, B is an alkali earth metal atom or Zn, X is a metal ion with d 10  configuration, n=m/2 or n=m/3 and n is 2. 
     
     
       6. The composition of  claim 5  wherein the photo-catalyst is obtained by a coprecipitation powder calcination method calcined at a temperature of 1150 to 1200° C. 
     
     
       7. The composition of  claim 5  wherein in the photo-catalyst X is In, Ga or Sb, alkali metal atom is Na, K or Rb and alkali earth metal atom is Ca, Sr or Ba.